MariaDB Galera Cluster is a synchronous multi-master cluster.
Galera Cluster is a virtually-synchronous multi-master, write-anywhere, nothing-shared clustering solution for MySQL. It features automatic data provisioning and parallel replication, and its main focus is on providing high availability and read scaling for the InnoDB engine.
It can be found under different names, depending on the vendor:
- Galera Cluster (from Codership) http://galeracluster.com/products/
- Percona XtraDB Cluster http://www.percona.com/software/percona-xtradb-cluster
- MariaDB Cluster https://mariadb.com/kb/en/galera/